I have rooted ALOT of figs in water.
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The key is temperature since water can swing high and low easier... be watchful by windows on cooler nights . I run lights under them... a stand that I can start seeds under... for bottom warmth
i use rainwater and lots of hydrogen peroxide. I do find that since they want co2 more than oxygen that I get alot of root formation above water in the early stages. By the time they are strong the h202 has released and turned to water and they seem stronger afterwards.
. I start off about 1 to 5 ratio with rainwater and without having to worry about the powdery stains left by hard calcified water.. which I'll use but only when short of rainwater and I have to change it more often when I do... with rainwater and occasionally dousing wherever anything besides figs grow i can avoid changing water as often with most of them, many not at all or just once or twice during the process
My primary hobby is to trial figs for this climate..Many do well in ground here but if they do well in pots then there is the potential for stardom! And some I just have to catch a taste of..
Water rooting imo is the best method for areas with warmer winters when mindful of the key factors... especially in keeping stable temps by a sunny window but with mind paid to fluctuations...temps between 65F and 85F seems to be the range some varieties like the top of the rangr and some move faster at the bottom of the range, i suspect it anyhow.
With that said it gets too hot to water root in the early to late spring here and so the variable is key in this climate... unless you are all in on controlling the conditions I let the window and the sun handle most of it
these are mostly trials, a few duplications and some that I just had to get. I am going to have to get a field. Just this morning i was thinking that someday I'll start a workshop where I'll teach ppl how to put these into water and to be mindful about stable temps .. yeah the roots can break but once you get the hang of it a root here or there is not an issue. I tend to pot up before alot of roots grow but when I do I take Jrmstssus's advice to place them in the container and to fill it with bike dry soil before wetting it.
The chances are higher but IF you put the time in and watch them regularly and correct all issues ... note cloudy water or odors .. never let one sit in water with one that is rotting.. the h202 can help offer alot of that, as does using rainwater.. the gel that some varieties form to heal is not an issue and clouds the water differently but I will still change it after a few days but so long as I can see the cutting easily through the water
So far this year I have roots on three
TFH Firehouse
Atreano
Labritja